配置例子：
C3550#show running-config
Building configuration. ..
Current configuration : 4143 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname C3550
!
ip subnet-zero
ip routing
!
cluster enable aaa 0
!
spanning-tree extend system-id
!
!
!
interface FastEthernet0/1
description UpLink FW
no switchport
ip address 192.168.0.1 255.255.255.0
!
interface FastEthernet0/2
no ip address
!
interface FastEthernet0/3
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
!
interface FastEthernet0/4
no ip address
!
interface FastEthernet0/5
no ip address
!
interface FastEthernet0/6
no ip address
!
interface FastEthernet0/7
no ip address
!
interface FastEthernet0/8
no ip address
!
interface FastEthernet0/9
switchport access vlan 9
switchport mode access
no ip address
!
interface FastEthernet0/10
no ip address
!
interface FastEthernet0/11
no ip address
!
interface FastEthernet0/12
no ip address
!
interface FastEthernet0/13
description Test Port 13
switchport access vlan 9
no ip address
!
interface FastEthernet0/14
description Test Port 14
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
!
interface FastEthernet0/15
no ip address
!
interface FastEthernet0/16
no ip address
!
interface FastEthernet0/17
no ip address
!
interface FastEthernet0/18
no ip address
!
interface FastEthernet0/19
no ip address
!
interface FastEthernet0/20
no ip address
!
interface FastEthernet0/21
no ip address
!
interface FastEthernet0/22
no ip address
!
interface FastEthernet0/23
no ip address
!
interface FastEthernet0/24
no ip address
!
interface GigabitEthernet0/1
no ip address
!
interface GigabitEthernet0/2
no ip address
!
interface Vlan1
ip address 192.168.1.1 255.255.255.0
no ip mroute-cache
!
interface Vlan2
ip address 192.168.2.1 255.255.255.0
!
interface Vlan3
ip address 192.168.3.1 255.255.255.0
! ic@es0">public@es0 RO
!
end